Block public namespace mail when quota exceeded

[Chris]

Steffen Kaiser wrote:
> On Thu, 25 Feb 2016, Chris wrote:
>
>> is it possible to temporarily reject mails, when quota of public
>> namespace
>> subfolder is exceeded? I'd check folder size with a cronjob.
>
> How does the MTA know that the message is filed into a public namespace?

deliver -m Public.somebox

> you mean users drop messages via Sieve script there? Yes, removing post
> and insert is a solution, but the message is still excepted by the MTA and
> generates a DSN if not resolved in a time.

I meant dovecot users are virtual. Dovecot runs as vmail system user, so
changing ACLs is probably not possible.